/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Remove an implemented interface, and its associated member function graphs. If bPreserveFunctions is true, then the interface will move its functions to be normal implemented blueprint functions
static void RemoveInterface ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) InterfaceClassPathName, bool bPreserveFunctions )